Aethub f



(No Model.) v A. P. WENDT.

BLAST FURNAGB.

No. 305,553.4 Patented'Sept. 23",'18'84.

WITNESSES llNiTED STATES ATENT OFFICE.

- ARTHUR F. VENDT, OF NEV YOARK, N. Y.

BLAST-FURNACE.

SPECIFICATIQN forming part of Letters Patent No. 305,553, datedSeptember 23, 1884.-.

Application filed April 19, 1884. (No model.)

invented certain new and useful Improvements in Blast-Furnaces forReducing Zinc Orcs, of which the following is a specication.

The blast-furnaces used in the smelting of iron or manganiferous ironores containing a' high percentage of zinc have been provided with a topchamber and an open iron funnel, through which a large part oftheblast-furnace gases escaped. The chamber has removable iron sideplates, which are retained in position by wedges, on which side plateszinc is condensed, and from the surface of which it is removed andcollected from time to time.

Heretofore it has been supposed that the iron top of the furnace had tobe open for charging the stock of ore, fuel, and flux, and allowing theescape of some of the zinc-bearing gases, while the remaining portion ofthe gases is drawn off and conducted through the flue and a downcomerinto the zinc condenser, and

' from the same to the hot-blast stoves for heating the air blown intothe blast-furnace and to the boilers for generating part ofthe steam bywhich the blowing-engine is operated.

The object of my invention is to so improve the blast-furnaces used forworking up ores containing zinc or residuum, or other zinciferous ores,that the top is entirely closed, and that practically all thevolatilized zinc is condensed and collected, and that all theblastfurnace gases be conducted to hot-blast stoves and boilers forutilization.

The invention consists of a blast-furnace for reducing ores containingzinc, having an iron top chamber with removable side wall plates, asupply-hopper, and a cover closing the opening of the hopper. Detachableangle-plates are arranged at the point of connection of the hopper withthe top chamber.

In the accompanying drawings, Figure 1 represents a vertical centralsection of my improved blast-furnace for reducing ores containing zinc.Fig. 2isahorizontal section through the top chamber of the same. Fig. 3is a detail vertical transverse section of the same. Fig. 4 is a modiedform of the top chamber, and Fig. 5 a detail of Fig. L

Similar letters of reference indicate corresponding parts. I

Referring to the drawings, A represents a blast-furnace of the usualconstruction, which is provided at the top part with a chamber, B. Theside walls of the chamber B are formed of removable iron plates, C,which may be constructed in sections and held in position by means ofVwedges that are driven between the side plates and lugs D, said lugsbeing part of the supporting-posts D', as shown in Fig. 3. Thesideplates C can be readily removed by loosening the wedges, so that thezinc deposited thereon can be broken off and removed. The supply-hopperE rests on the top of the chamber B and extends to the charging-floor. Acircular angle-plate, E', is secured to the under side of the top plateof the chamber B, and secured thereto by bolts, so that it can beremoved and replaced by a new one when burned out. The charging-openingof the hopper E is tightly closed by a bellshaped cover, E2, that isbalanced in suitable manner, so as to be readily opened or closed. Ahorizontal fine, G, conveys the gases from the top chamber, B, to thedowncomer H and the zinc-condenser, from which they are conducted to thehot-blast stoves and. boilers, where they are burned for heating the airblown into the furnace and generating the steamfor running theblowing-engine.

The advantage of the closed top chamber, B, is that a larger volume ofgas is necessarily carried through the iue G and downcomer H, and thatthe zinc which formerly escaped with a certain volume of gas through theopening of the top chamber can be collected, so that, for example, fromone and one-half to two per cent. more, or from ve to six per cent. ofthe six to seven per cent. of zinc contained in residuum, can be saved,whereas formerly the result was only from three and one-half to four percent. A further advantage is that by the increased volume of gas whichis conducted to the hot-blast stoves higher temperature can be impartedto the hot blast. In other words,

IOO

Thus, while formerly the average of spiegeleisen made out of residuumfrom franklinite was fifteen to eighteen per cent., it is by the use ofa closed-top furnace increased to from eighteen to twenty-one per cent.A modified form of my improved closed top for furnaces is shown in FigA,in which the hopper E is supported by the charging-floor and made torest on semi-circular angle-plates E', which are fastened upon the topof the iron chamber B of the furnace. The angle-platesl E are boltedtogether, as shown in Figs. 4 and 5. These angle-plates have a taperingface for the conical cover E2, which is raised orlowered by suitablemeans. The lowering of the. cone E2 allows the ore and fuel to becharged directly into the furnace, while the raising of the cone closesthe supplyhopper- The advantage of this construction is that the angie-plates can be conveniently removed at any moment from the outside ofthe furnace and replaced by new vones when burned out.

Having thus described my invention, I claim.

invention I have signed my name in presence of two subscribingwitnesses.

ARTHUR F. WENDT.

Witnesses:

MARTIN PETRY, SIDNEY MANN.

